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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function fun() {
            var sum = 0;
            for (var i = 0; i < arguments.length; i++) {
                sum += arguments[i];

            }

            console.log('所有的参数之和为：' + sum); //110
        }

        fun(33, 22, 55)
    </script>
</body>

</html>